Backpack has a total of 5 compartments:- Two main compartments with zippers (they have smaller pockets inside), - Two small pockets with zippers,- One pocket with Velcro on backpack's back.The backpack is very solid.It is equipped withlaser-cutmodular systemthat facilitatepinning of any additionalequipment. Back andshoulder straps have sponge insidewhilethe hip beltandshoulder strapsare adjustable.It is possible tocompressthe backpackusing side pullers.